Amazing Enamel Plaque

This is an amazing enamel painting on copper of a lady with her baby most likely Marie Antoinette and one of her children made around 1800 but am not sure of the exact date. Not sure either where it was made but I suspect Austria but it might also be French or even English though I doubt the latter. It is the best quality piece I have ever come across and of a nice size as well. The painting shows a lady sitting in a chair dressed in a red dress with grey hair - likely a wig which was in fashion back then - with a infant dressed in a white dress and a blue ribbon. Might be a boy or a girl. The background includes an urn with some sort of ivy coming out of it, nice clouds, a wall and some sort of curtain possibly. The detail and the quality are amazing as you can see in the pictures. The painting comes in a frame though that is not original. Still nice and works well with it. The frame is 11 inches wide by 9.75 inches tall. The plaque part that shows is 5.75 inches by 4.75 inches. The frame is in good condition. The plaque is in great condition with two or three hard to spot lines, a restored spot on the top left as show (in the curtain area which is not important) and a spot on the very right which is hidden by the frame. The very edge has a few minor nibbles also hidden by the frame. A superb piece and siplays perfectly! Not signed nor marked but that is the norm. Please email me for more information or other pictures.